Details
| Original language | English |
|---|---|
| Title of host publication | Organosilicon Chemistry VI |
| Subtitle of host publication | From Molecules to Materials |
| Publisher | Wiley - VCH Verlag GmbH & CO. KGaA |
| Pages | 948-954 |
| Number of pages | 7 |
| ISBN (print) | 3527312145, 9783527312146 |
| Publication status | Published - 26 Jul 2005 |
Abstract
Linear polypropylene imines with low molecular mass were found in the shells of diatoms and are thought to influence the biomineralization process in these algae [l]. In order to elucidate the chemistry in polyamine-silica model systems, we have investigated the kinetics of silica condensation in the presence of various polyethylene and polypropylene imines using the molybdate method. All amines accelerate the silica condensation, with the degree of acceleration depending on the chemical nature of the polyamines (ethylene or propylene linkages, methylated or nonmethylated), their degree of polymerization, and their architecture (linear or branched). The degree of acceleration seems to scale with the increase in pH which the amines cause in the reaction solution. Therefore, it appears that the main influence of the polyamine on the first steps of the silica condensation reaction (to which the molybdate method is sensitive) is by the adjustment of the pH value. Interestingly, nature has chosen amines which give rise to only a moderate degree of acceleration and not those which provide the strongest acceleration. In the natural biosilicification systems, this may allow for more time to form the intricate macrostructures of the biominerals.
Keywords
- Biomineralization, Polyamines, Silica, Silica condensation
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
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Organosilicon Chemistry VI: From Molecules to Materials. Wiley - VCH Verlag GmbH & CO. KGaA, 2005. p. 948-954.
Research output: Chapter in book/report/conference proceeding › Contribution to book/anthology › Research › peer review
}
TY - CHAP
T1 - Silicon-Based Materials
T2 - Investigations into the Kinetics of the Polyamine-Silica System and Its Relevance to Biomineralization
AU - Bärnreuther, Petra
AU - Johns, Michael
AU - Krüger, Ilka
AU - Behrens, Peter
AU - Horstmann, Sandra
AU - Menzel, Henning
PY - 2005/7/26
Y1 - 2005/7/26
N2 - Linear polypropylene imines with low molecular mass were found in the shells of diatoms and are thought to influence the biomineralization process in these algae [l]. In order to elucidate the chemistry in polyamine-silica model systems, we have investigated the kinetics of silica condensation in the presence of various polyethylene and polypropylene imines using the molybdate method. All amines accelerate the silica condensation, with the degree of acceleration depending on the chemical nature of the polyamines (ethylene or propylene linkages, methylated or nonmethylated), their degree of polymerization, and their architecture (linear or branched). The degree of acceleration seems to scale with the increase in pH which the amines cause in the reaction solution. Therefore, it appears that the main influence of the polyamine on the first steps of the silica condensation reaction (to which the molybdate method is sensitive) is by the adjustment of the pH value. Interestingly, nature has chosen amines which give rise to only a moderate degree of acceleration and not those which provide the strongest acceleration. In the natural biosilicification systems, this may allow for more time to form the intricate macrostructures of the biominerals.
AB - Linear polypropylene imines with low molecular mass were found in the shells of diatoms and are thought to influence the biomineralization process in these algae [l]. In order to elucidate the chemistry in polyamine-silica model systems, we have investigated the kinetics of silica condensation in the presence of various polyethylene and polypropylene imines using the molybdate method. All amines accelerate the silica condensation, with the degree of acceleration depending on the chemical nature of the polyamines (ethylene or propylene linkages, methylated or nonmethylated), their degree of polymerization, and their architecture (linear or branched). The degree of acceleration seems to scale with the increase in pH which the amines cause in the reaction solution. Therefore, it appears that the main influence of the polyamine on the first steps of the silica condensation reaction (to which the molybdate method is sensitive) is by the adjustment of the pH value. Interestingly, nature has chosen amines which give rise to only a moderate degree of acceleration and not those which provide the strongest acceleration. In the natural biosilicification systems, this may allow for more time to form the intricate macrostructures of the biominerals.
KW - Biomineralization
KW - Polyamines
KW - Silica
KW - Silica condensation
UR - http://www.scopus.com/inward/record.url?scp=84889781537&partnerID=8YFLogxK
U2 - 10.1002/9783527618224.ch6
DO - 10.1002/9783527618224.ch6
M3 - Contribution to book/anthology
AN - SCOPUS:84889781537
SN - 3527312145
SN - 9783527312146
SP - 948
EP - 954
BT - Organosilicon Chemistry VI
PB - Wiley - VCH Verlag GmbH & CO. KGaA
ER -